This female needs help. After city driving for about 10 miles and brakes heat up I have trouble stopping. Car skips over the highway much like you would skip a stone over water. My mechanic says he can do no more with the brakes and that model just has terrible brakes. Nothing else is wrong with this car and I hate to give it up but am at the mercy of mechanics. Sometimes when I back up I hear a noise that sounds like I just ran over someones wagon left be hind the car. Any ideas?